Hi arif24,
We really need to know how well you perform when taking a FULL-LENGTH CAT under realistic conditions. Even if you are focused on your Quant studies right now, on Test Day you do not get to 'stop' after taking the Quant section - you know that you will have 3 other sections to complete and that 'reality' is important to mirror during your studies. If sitting for a 4-hour Exam will increase your likelihood of making little mistakes in the Quant section, then it's better to know that NOW (when we have more time to 'fix' whatever needs fixing). As such, I highly recommend that you take your next CAT in FULL and take it in a realistic fashion (take the FULL CAT - with the Essay and IR sections, take it away from your home, at the same time of day as when you'll take the Official GMAT, etc.). Once you have that score, you should report back here. Once we have that result, we can discuss how best to proceed.
GMAT assassins aren't born, they're made,
Rich